■Dirt on the back of paper

<User Check>

- This problem may disappear after printing approximately 10 pages of completely blank sheets.

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

 

 

 

 

 

Scratch and Dirt

Is the pressure roller

Yes

Print approximate 10 pages.

1

on the fuser unit

ASSY dirty? Is any other

 

 

No

Replace the fuser unit.

 

 

area in the machine dirty?

 

 

 

 

 

 

Scratch and Dirt

Is the paper feed system

 

Wipe dirt off.

2

in the paper feed

dirty?

Yes

 

 

system

 

 

 

 

 

 

 

 

■ Vertical streaks

<User Check>

-This problem may occur with noise which is caused by dirt on the corona wire in the drum unit. In this case, clean the corona wire with the wire cleaner.

- Replace the drum unit with a new one.

- Replace the toner cartridge with a new one.

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

 

 

 

 

 

Scratch and Dirt

Is the paper feed system

 

Wipe dirt off.

1

in the paper feed

dirty?

Yes

 

 

system

 

 

 

 

 

 

 

 

 

Scratch and Dirt

Are there scratch and

 

Replace the drum unit.

2

on the exposure

dirt on the surface of the

Yes

 

 

drum

exposure drum?

 

 

 

 

 

 

 

 

Scratch and Dirt

Are there scratch and

 

Replace the fuser unit.

3

on the heat roller

dirt on the surface of the

Yes

 

 

 

heat roller?

 

 

 

 

 

 

 

CAUTION :

•If the machine prints the same pattern, especially including vertical streaks, continuously, black vertical streaks may appear on the paper since the electrostatic performance of the exposure drum is decreased temporally.

■Black vertical streaks in a light background

<User Check>

-Clean the inside of the machine and the corona wire in the drum unit.

-Replace the toner cartridge with a new one.

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

 

 

 

 

1

Drum unit failure

Is the problem solved after

Yes

Replace the drum unit.

 

replacing the drum unit?

 

 

 

 

 

 

 

 

 

 

3-51

Confidential